Reasons for Longitudinal Cracking of Stainless Steel Seamless Pipes

Although the longitudinal cracking phenomenon of stainless steel seamless pipe is a very serious problem and vary to seen, but it happened sometimes, and will make the pipe unusable. So, what causes this phenomenon?

When the stainless steel seamless pipe has longitudinal cracking, the stainless steel pipe appears to penetrate the pipe wall longitudinally, which is sudden. Usually it occurs on the whole body of the stainless pipe, and sometimes occurs at the end of the hammer. Here are the reasons:

1. If the reduction in large, the degree of uneven deformation will increase, and the residual stress will increase.

2. There are too many consecutive drawing passes during the air drawing, and the steel pipe has a large residual stress and work hardening.

3. Improper annealing includes too low temperature, uneven temperature or too short time.

4. The pipe wall of the transition part after the hammer head is partially recessed too deep or the end of the stainless steel seamless pipe after drawing is uneven, and there are notches that cause stress concentration and cracking.

5. It was not baked or annealed in time after drawing, and it was shocked during shelving.

In general, the cause of longitudinal cracking of stainless steel seamless pipes is caused by substandard manufacturing. Therefore, in order to avoid this phenomenon in stainles steel seamless pipes, it is necessary to strictly regulate the production process operation.

HCADTO Stainless Steel Co., Ltd. the Stainless Steel Division of ADTO GROUP, specializes in manufacturing stainless steel pipes, stainless steel angle bar, flat bar, round bar, square bar, hexagonal bar and channel bar in various grades and sizes. Our years of production experience and manufacturing facilities will ensure the good quality and competitive duration of our products.